function venstermaten(type) 

		{

		  var myWidth = 0, myHeight = 0;

		  if( typeof( window.innerWidth ) == 'number' ) {

			//Non-IE

			myWidth = window.innerWidth;

			myHeight = window.innerHeight;

		  } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {

			//IE 6+ in 'standards compliant mode'

			myWidth = document.documentElement.clientWidth;

			myHeight = document.documentElement.clientHeight;

		  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {

			//IE 4 compatible

			myWidth = document.body.clientWidth;

			myHeight = document.body.clientHeight;

		  }

		  

		  if (type=='breedte') { return myWidth; } else { return myHeight; }

		}
		
function Weergeven(id)

{

	var gedeelte = eval(id);
	
	if (gedeelte.style.display == "none")

	{

		gedeelte.style.display = "block";
		var plaatje = eval("img" + id.substring(2));
		plaatje.src = min.src;

	}

	else

	{ 

		gedeelte.style.display = "none";
		var plaatje = eval("img" + id.substring(2));
		plaatje.src = plus.src;
	}
	
	

}		

function Controle()

{
	var controlegetal = 0;
	var frm = InformatieFormulier;
	
	//controle gewone velden
	if (frm.naam.value=="" || frm.naam.value==null) { controlegetal = 1; }
	if (frm.onderwerp.value=="" || frm.onderwerp.value==null) { controlegetal = 1; }
	if (frm.bericht.value=="" || frm.onderwerp.value==null) { controlegetal = 1; }
	
	//controle e-mailveld
	var apestrt = frm.email.value.indexOf('@');
	var punt = frm.email.value.indexOf('.');
	var lengte = frm.email.value.length;

	if (apestrt!=-1)
	{
		if (frm.email.value.substr(apestrt+1)=="jdegoei.nl") { controlegetal = 1; }
	}
	
	if (!(apestrt!=-1 && punt!=-1 && lengte>5)) { controlegetal = 1; }

	if (frm.naam.value==frm.email.value && frm.naam.value==frm.onderwerp.value && frm.naam.value==frm.bericht.value) { controlegetal = 1; }
	
	if (controlegetal!=0) 
	{ 
	
		alert('U hebt het formulier niet goed ingevuld.'); 
		return false; 
	
	}

	else

	{
		frm.zendmeel.value="Go3D";
		return true;

	}		

	
}